When groupings of ancestral populations diverge through time into different species as a result of periods of geographic isolation, this process is known as allopatric speciation.
Therefore, allopatric and secondary Site speciation is favoured if a given sympatric species pairing rate is too high to be explained by such combinations.
As a result, sympatric velocities are among the fastest for allotropic-symtopic pairs of species, being 2 to 5 times faster than ectopic velocities. Even within these ratios, variations are predicted because species matings may vary depending on certain evolutionary processes, population.
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